Optimizing Cogging Torque Reduction in Slot Opening Shift Method for BLDC motor by RSM

The main target of this paper is optimizing the slotopening shift for cogging torque reduction in BLDC motors. In a slot-opening shift method there is no skew, therefore the known drawbacks of the skewing is prevented. In the first part of the paper the slot-opening shift method for a BLDC motor is discussed. In this case, it is desired to find a method for cogging torque reduction without deteriorating the trapezoidal shape of back- EMF. In the second part optimization of this method is discussed. In this case, it’s tried to optimize the amount of shifts in slot opening for maximum reduction in cogging torque. Response surface Method (RSM) which is a branch or Design of Experiments (DOE) is used as optimization Method. The simulation result by finite element shows a considerable reduction in the cogging torque of the optimized motor. Moreover the simulation verifies the quality of back-EMF shape in each case.

Keywords:

BLDC Motors , Finite Element Methods , DOE